/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package servlets;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.RequestDispatcher;
import model.Algorithm;

import java.io.*;
import java.util.*;

/**
 *
 * @author Administrator
 */
public class LoadAlgoServlet extends HttpServlet {

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        RequestDispatcher requestDispatcher = request.getRequestDispatcher("index.jsp");
        try {
            request.setAttribute("algorithms", getAlgorithms());
            requestDispatcher.forward(request, response);
        } finally {
            out.close();
        }
    }

    private List<Algorithm> getAlgorithms() {
        List<Class> classes = new ArrayList<Class>();
        ArrayList<Algorithm> algorithms = new ArrayList<Algorithm>();
        try {
            //out.println(getServletContext().getRealPath("/AlgoConfig/Algos.csv"));
            File file = new File(getServletContext().getRealPath("/AlgoConfig/Algos.csv"));
            Scanner scanner = new Scanner(file);
            while (scanner.hasNext()) {
                classes.add(Class.forName(scanner.nextLine()));
            }

            for (Class c : classes) {
                algorithms.add((Algorithm) c.newInstance());
            }

        } catch (FileNotFoundException ex) {
            Logger.getLogger(PricerCTRLServlet.class.getName()).log(Level.SEVERE, null, ex);
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(PricerCTRLServlet.class.getName()).log(Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            Logger.getLogger(PricerCTRLServlet.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            Logger.getLogger(PricerCTRLServlet.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            return algorithms;
        }
    }
    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}
